// 定义一个mixin
@mixin larget-text {
  font: {
    family: Arial;
    size: 20px;
    weight: bold;
  }
}

// 引用mixin
.page-title {
  @include larget-text;
  padding: 4px;
  margin-top: 10px;
}

@mixin border-radius($radius) {
  -webkit-border-radius: $radius;
     -moz-border-radius: $radius;
      -ms-border-radius: $radius;
          border-radius: $radius;
}
.box {
  @include border-radius(10px);
}